Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： Based on literature research, specimens identification and field investigation, we systematically cleared up the early researches of Sedum and conducted an overview for the species diversity of Sedum in Guangxi. There are 17 species was confirmed, among which six species are newly recorded. At first, the research brief histories of Sedum taxonomy in Guangxi were summarized. The following is the revised information for S. polytrichoides Hemsl. Six newly recorded species of Sedum are reported here, which are S. leblancae Hamet., S. lipingense R. B. Zhang, D. Tan & R. X. Wei, S. lungtsuanense S. H. Fu, S. makinoi Maxim., S. subtile Miq., S. tosaense Makino. The morphological feature diagnosis and photographs for these newly recorded species were provided. Finally we also discussed the species diversity and the potential utilization of Sedum in Guangxi. It is hoped to provide background information for the subsequent research and utilization of this genus.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-18 Cooperative journals: 《广西植物》
Abstract： In order to explore the relationship between the growth of Paris polyphylla var. chinensis and the microbial community structure changes of the rhizosphere soil, the Illumina high-throughput sequencing technique was used to sequence the 16S rRNA gene of bacteria and 18S sequences of fungal at four different growth years, including 3 years, 5 years, 7 years and 9 years. The results were as follows: (1) Proteobacteria, Acidobacteria, Actinobacteria and Chloroflexi were dominant bacteria in the rhizosphere soil of P. polyphylla in different growth years. The dominant fungi phylas were Ascomycota, Basidiomycota and Mucoromycota. (2) The bacterial species in the rhizosphere of Paris polyphylla in different growth years were more abundant than fungi, and the degree of diversification was higher. The lowest point of bacterial diversity, which decreased, increased, and then decreased again with the increase of growth years showed a pattern of “И”, was at the 5th year and the highest point was at the 7th year. The fungal diversity showed a pattern of “ Λ ” that first increased and then decreased with the increase of growth years, and the highest point was at the 7th year. The abundance of bacterial communities also showed a pattern of “Λ” that first increased and then decreased with the increase of growth years, and the highest point was also at the 7th year. The abundance of fungi did not change much as the year growing. (3) The UPGMA cluster analysis showed that the microbial community structure of the rhizosphere soil had evolved significantly. The period when the bacterial community evolved more drastically was in the 7th year after planting, and the fungal community was in the 5th. (4) Spearman correlation analysis found that total nitrogen and available potassium were the main factors affecting the composition of rhizosphere soil bacteria, and Total potassium was the main factor affecting the composition of fungi. All the above results indicate that the composition and structure of the soil microbial community in the rhizosphere of wild P. polyphylla at different growth and development stages are different, and the 5-7th year is a critical period for significant changes in the diverdity of the soil microbial community.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Leaf chlorophyll content is central to carbon, water and energy exchange between the biosphere and the atmosphere, also to the terrestrial ecosystem function. Quantitative estimates of leaf chlorophyll content with hyperspectral imagery can provide scientific insight for assessing plant’s growth and stress as affected by abiotic and biotic factors. However, few studies have been conducted the application of spectral indices in estimation of leaf chlorophyll contents of plants in karst areas, especially in South China. After a review of the application of common spectral indices in estimation of leaf biochemistry parameters, we found that most of the common spectral indices were developed based on the difference, simple ratios, normalized difference and inverse difference formulation of leaf spectral reflectance. Therefore, we firstly measured the raw reflectance spectra of leaves from four typical karst species, namely Vitex negundo, Rhus chinensis, Celtis sinensis and Alchornea trewioides with a ASD Field Spec 4 (Analytical Spectral Devices, Inc., Boulder, Colorado, US) spectrometers. We then used the above-mentioned four formulations to process the raw reflectance spectra and their first-order derivative spectra. Finally, we analyzed the relation between leaf chlorophyll contents and relative leaf raw reflectance spectra and their first-order derivative spectra, and tried to propose the best spectral index for estimation leaf chlorophyll content of the plants of karst areas in South China. The results were as follows: (1) Among the common spectral indices, the modified normalized difference vegetation index (mND705) performed well in estimation leaf chlorophyll contents of four typical karst species in term of the determination coefficient (R2 was equal to 0.45) and root mean squared error (RMSE was equal to 0.26 mg•g-1). (2) However, most of the common spectral indices were not suitable for estimation leaf chlorophyll content of the plants in karst areas. Thought the prediction capability of fluorescence ratio index (FRI1) and chlorophyll absorption area index (CAAI) were almost the same in estimation of leaf chlorophyll content of plants in karst and non-karst areas, their accuracy of prediction was relative low according to the determination coefficient. (3) The spectral indices proposed in this study performed well in estimation leaf chlorophyll content of the plants in karst areas either based on the raw reflectance spectra or their first-order derivative spectra compared against others common spectral indices, especially for the difference spectral index based on the first-order derivative spectra (dD(760, 769)). Its determination coefficient was 0.71 and the root mean squared error was 0.19 mg•g-1. We, therefore proposed that the difference spectral index based on the first-order derivative spectra (dD(760, 769)) can be used for estimation leaf chlorophyll content of the plants in karst areas. Our results concluded that leaf chlorophyll content of plants in karst areas can be quickly and quantitatively estimated using spectral index combined with hyperspectral remote sensing data. These results can also provide scientific insights for estimating plants’ growth and their adaptation to environmental stress.
Subjects: Biology >> Botany >> Applied botany submitted time 2019-08-26 Cooperative journals: 《广西植物》
Abstract： The chemical constituents of essential oil of needles from Abies. ziyuanensis and A. yuanbaoshanensis were compared to provide a theoretical basis for the development and utilization of this two firs. Essential oil of needles were extracted by steam distillation, and were determined by GC-MS analysis. The relative content of each component was calculated based on the peak area normalization method. The results show that 21 and 22 kinds of chemical substances were identified in the essential oil of needles from A. ziyuanensis and A. yuanbaoshanensis, respectively. Among which 15 kinds chemical substances were the common components of this two firs; The Olefinic substances were the highest content in essential oil of needles from both A. ziyuanensis and A. yuanbaoshanensis, the proportion were 95.94 % and 95.02 %, respectively. Among the common components of two firs, β-Pinene, l-Caryophyllene, Camphene, a-Caryophyllene and Terpinolene have high development and utilization value; in terms of non-common components, a-Terpineol and a-Pinene in A. ziyuanensis both a-Muurolene and Leaf alcohol in A. yuanbaoshanensis had great development and utilization value.
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